Pen point



Nov. 7, 1933. s. v. PAWLANSKY PEN POINT Filed April 12, 1953 ,Dwenlbr: J. Klawlansfizy B? m -L f1 Ziornqys Patented Nov. 7, 1933 UNITED STATES PATENT Ol' FlCE 6 Claims.

This invention relates to pen points particular- Ly those adapted for fountain pens. The chief object is to attain for pen points the form of pencil points with the accruing advantages of improved handiness and ease and increased speed of writing and with the added advantage of being ever-pointed.

The annexed drawing is an axial, sectional, detached view of the nozzle portion of a vacuum 10 fountain pen which embodies a preferred form of the new pen point. Taking advantage of the pencil-like form of the pen point the handle of the pen point is also enabled to be pencil-like.

The reservoir 4 is cylindrical but tapers conically at the bottom to a reduced cylindrical tube leading to a further reduced cylindrical tube into which the pen point is tightly fitted and held as by an adhesive.

The pen point comprises the following two parts, a writing tip 1 and a capillary tube 5 which serves as the ink duct.

The writing tip 1 which is a thin hemispherical shell is permeable and absorbent (as to inks) preferably to the maximum degree practicable. To that end, it should preferably be of uniform thickness preferably the minimum practicable consistent with adequate strength (perhaps onethousandth of an inch). Its porosity and absorptiveness (wettableness) as to inks should' preferably be of the maximum practicable. It

should preferably be chemically immune as to inks and air and-be sufiiciently strong, hard tough et cetera. The outer diameter of the hemispherical shell may be the optimum (perhaps one-hundredth of'an inch). The external 'surface of the shell should be practically-continuous, rigid and smooth, preferably.

A permeable and absorbent material such as consolidated metal powder may preferably be employed. Consolidated powder of materials other thanmetal may qualify and furthermore the purposes may conceivably be effected by capillary, porous structures aside from consolidated powder material such asrfo'r example, capillary porous structures composed of very fine wires. These wires may perhaps be as fine as one-tenthousandth of an inch in diameter and be formed spirally or in a haphazard mass to the form of a porous hemispherical shell. An alternative material may be porous vulcanite or fritted glass to a limited extent.

The voids (interstitial-spaces) between the individual particles of metal powder may be of microscopic size but not necessarily. They are, of course, of capillary dimension and intercommunicate. The Particles are welded (sintered) to each other at their multiple points of contact. The particles should preferably be spherical andamooth. 'Ametalspraygim (similartopaint sprayguns) maybeemployedtomake them.

The upper end of the capillary tube 5 is open I and is dipped into the lower end of the ink column. Inkvflows down it to the writing tip 1 into whose pores the is absorbed throughout uniformly also by capillary attraction.

When the writing tip 1 is in contact with awriting surface, ink is withdrawn from the lower outer ends of the pores (orifices of the intercommunicating system of interstitial capillary spaces between the particles) onto the writing surface by adhesion to and absorption into the paper.

The air inlet opening 3- permits air to enter the reservoir to displace the ink as it is being exhausted in writing.

The writing tip 1 may be fixed to the capillary tube 5 as by welding.

The nozzle portion of the handle! is a suitable fountain pen environment for the pen point.

The pen point may be'formed from powdered metal by means of a mold, heat and pressure. For example, a proper mold may be filled with the metal powder and a plunger applied to compress the mass at high pressure. The formed article may then be heated to cause sintering.

I claim: 1. A pen point whose writing tip is-composed of a thin, homogeneous capillary, porous, metallic structure substantially asdescribed, so that the ink feeding through same permeates uniformly throughout the body and surface.

2. The structure set out in claim 1, in which the writing tip is formed as a thin convex shell.

3. A pen point whose writing tip is composed of a thin, homogeneous capillary. p rous, rigicL-hard structure substantially as descrlbed, so that the ink feeding through same permeates uniformly throughout the body and surface.

4. The structure set out in claim 3, in which the I writing tip is formed as a thin convex shell.

5. A pen point as claimed in claiml, in which the structure composing the tip is made up of substantially spherical particles.

6. A penpoint as claimed in claim 3, in which the structure composing the tip is made up of substantially spherical particles.

.- SAMUEL VICTOR PAWLANSKY. 

